A device for dividing up a volume of liquid contained in an original container by filling bottles that are smaller than the original container, including a source of pressurized gas, a first line running from the source of pressurized gas and opening into the original container so as to place it under pressure, and a line for withdrawing the contents of the original container, connecting the latter to one of the smaller bottles. A second line runs from the pressure source and ends in the smaller bottle to be filled. Means are provided for closing and opening the first and second lines and a member is provided for activating the means for closing/opening so as to open the second line then the pressurization line in sequence, and close these same lines in sequence in the reverse order.